Knowing how far a patient can bleed before you transfuse is one of the most useful numbers in a case — and one of the first to slip when both your hands are busy.
This calculator runs it from the patient you already entered. You get the estimated blood volume and the maximum allowable blood loss up front, and you can work in whichever you think in: a tap flips the whole screen between hemoglobin and hematocrit.
The Need to transfuse? Slide in the estimated blood loss and watch the projected current value fall toward the floor you set; the moment it crosses, it tells you the packed red cells to bring it back — units for an adult, milliliters per kilogram for a child.
Set the floor to match your patient — restrictive for most, higher for cardiac or cardiovascular disease — and every number moves with it. Tap the patient's blood type to see what they can safely receive, and open the rationale for the formulas (the average-hematocrit Gross method) and the restrictive transfusion triggers behind the call.
What's included
- Estimated blood volume with adult, pediatric, and habitus factors
- Maximum allowable blood loss, worked in hemoglobin or hematocrit
- A “Need to transfuse?” planner: the projected value as loss climbs, plus the packed cells to restore your floor — units for adults, mL/kg for children
- Tap-to-pick blood-type compatibility
- A built-in rationale: the formulas and restrictive AABB transfusion triggers
- Every input drawn from the shared patient profile